public DeflateStream(Stream stream, CompressionMode mode, bool leaveOpen)
{
if (stream == null)
throw new ArgumentNullException("stream");
if (CompressionMode.Compress != mode && CompressionMode.Decompress != mode)
throw new ArgumentOutOfRangeException("mode");
this.BaseStream = stream;
_mode = mode;
_leaveOpen = leaveOpen;
switch (_mode)
{
case CompressionMode.Decompress:
if (!BaseStream.CanRead)
throw new ArgumentException("Stream is not readable.", "stream");
_inflater = new Inflater();
_callBack = ReadCallback;
break;
case CompressionMode.Compress:
if (!BaseStream.CanWrite)
throw new ArgumentException("Stream is not writeable", "stream");
_deflater = new Deflater();
_asyncWriterDelegate = this.InternalWrite;
_callBack = WriteCallback;
break;
}
_buffer = new byte[DefaultBufferSize];
}
// Implies mode = Compress
public DeflateStream(Stream stream, bool leaveOpen)
{
if (stream == null)
throw new ArgumentNullException("stream");
if (!stream.CanWrite)
throw new ArgumentException("Stream is not writeable.", "stream");
this.BaseStream = stream;
_mode = CompressionMode.Compress;
_leaveOpen = leaveOpen;
_deflater = new Deflater();
_asyncWriterDelegate = this.InternalWrite;
_callBack = WriteCallback;
_buffer = new byte[DefaultBufferSize];
}
protected override void Dispose(bool disposing)
{
try
{
this.PurgeBuffers(disposing);
}
finally
{
// Close the underlying stream even if PurgeBuffers threw.
// Stream.Close() may throw here (may or may not be due to the same error).
// In this case, we still need to clean up internal resources, hence the inner finally blocks.
try
{
if (disposing && !_leaveOpen && BaseStream != null)
this.BaseStream.Dispose();
}
finally
{
this.BaseStream = null;
try
{
if (_deflater != null)
_deflater.Dispose();
}
finally
{
_deflater = null;
base.Dispose(disposing);
}
}
}
}
